Re: Handler-Bind question...

[reti@cambridge.apple.com (Kalman Reti)]

At 17:19 9/29/94 +0000, Matt Schmill wrote:
>Hello all... I'm building an error handling macro that I want to use for a GUI
>on top of a portable application. The macro will basically be :
>
>(defmacro with-error-handling (&body body)
>  (handler-bind ((error (condition) ...)
>                 (warning (condition) ...))
>        ,@body))
>
>the problem is that I can't differentiate clearly between the two cases;
>If there is an error, I want to jump out of the body. a throw/catch form will
>  allow this. But if there's a warn, I want to finish evaluation of BODY 
>  _without the warning being displayed_ in the listener. I want my GUI to
>handle
>  these cases without the listener displaying anything.
>
>handler-case has the opposite problem. I can't seem to find a way to resume the
>  body if the WARNING is trapped. 
>
>Does anyone out there have a clever solution ? If so, I'd love to hear it..
>(redefining the warn function is out of the question)


See CLTL2 page 913's description of the muffle-warning function.  It is intended
for use in condition handlers to do precisely this.

>
>thanks in advance